Defunct and No more

Defunct adjective - No longer existing.

No more and defunct are semantically related In some cases you can use "No more" instead an adjective "Defunct".

No more adverb - Referring to the degree to which a certain quality is present.

Defunct and no more are semantically related in not present topic. You can use "Defunct" instead an adjective phrase "No more", if it concerns topics such as no longer alive, no longer operating as a business.